Occlusal teeth surface accuracy of milled complete dentures: a comparison between different manufacturing techniques.

IF 2.5 3区 医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE
Journal of Advanced Prosthodontics Pub Date : 2025-08-01 Epub Date: 2025-08-19 DOI:10.4047/jap.2025.17.4.185
Leonardo Ciocca, Mattia Maltauro, Volodymyr Kravets, Roberto Meneghello, Angela Montanari, Lorenzo Breschi, Laura Anderlucci
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引用次数: 0

Abstract

Purpose: This study aims to compare the occlusal trueness and precision of teeth manufactured using two modern digital milling processes.

Materials and methods: A total of 38 complete dentures (CDs) were fabricated and analyzed. CDs in Group 1 (monolithic) (n = 19) were produced using a monolithic bicolor resin disk, whereas in Group 2 (oversize) (n = 19) were fabricated using the oversize process, which involves two separate resin disks of different colors. Two investigation methods were developed to evaluate trueness and precision: cusp area analysis and cusp vertex analysis. The study included three levels of analysis: a comparison of the two measurement methods, an evaluation of the monolithic versus oversize processes, and an assessment of under- and overcontouring inaccuracies.

Results: Statistical analysis using the Welch two-sample t-test, the non-parametric Wilcoxon signed-rank test, and the modified signed-likelihood ratio test (SLRT) revealed a statistically significant difference (P < 2.2 × 10-16) between the two measurement methods (vertex vs. area) for both the monolithic and oversize groups, with the vertex method demonstrating greater accuracy. The analysis of over- and undercontouring inaccuracies revealed that 55% of the surface for the monolithic process exhibited overcontouring, compared to 99% for the oversize process, indicating a strong tendency toward surface roughness in the latter.

Conclusion: The monolithic milling method exhibited significantly superior accuracy compared to the oversize process (P < .05). Additionally, the Reference Point System (RPS) metrological method proved more reliable than the best-fit method for comparing complex structures, offering more accurate estimates of both trueness and precision.

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铣削全口义齿的咬合齿面精度:不同制造工艺的比较。
目的:比较两种现代数字铣削工艺制作的牙合正确率和精度。材料与方法:对38例全口义齿进行制作与分析。第1组cd(单片)(n = 19)使用单片双色树脂磁盘生产,而第2组(超大)(n = 19)使用超大工艺制造,其中涉及两个不同颜色的单独树脂磁盘。建立了两种评价准确性的调查方法:尖面积分析和尖顶点分析。该研究包括三个层次的分析:两种测量方法的比较,单片与超大尺寸过程的评估,以及轮廓不足和过度不准确性的评估。结果:使用Welch双样本t检验、非参数Wilcoxon符号秩检验和改进的符号似然比检验(SLRT)进行统计分析显示,对于单体型和超大体型组,两种测量方法(顶点vs.面积)之间存在统计学显著差异(P < 2.2 × 10-16),其中顶点方法显示出更高的准确性。对轮廓过度和轮廓不足不准确性的分析显示,整体工艺中55%的表面表现出轮廓过度,而超大工艺中这一比例为99%,这表明后者的表面粗糙度有很强的趋势。结论:整体铣削法的精度明显优于超径铣削法(P < 0.05)。此外,参考点系统(RPS)计量方法被证明在比较复杂结构时比最佳拟合方法更可靠,提供了更准确的真实度和精度估计。
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来源期刊
Journal of Advanced Prosthodontics
Journal of Advanced Prosthodontics DENTISTRY, ORAL SURGERY & MEDICINE-
CiteScore
4.70
自引率
3.80%
发文量
25
期刊介绍: This journal aims to convey scientific and clinical progress in the field of prosthodontics and its related areas to many dental communities concerned with esthetic and functional restorations, occlusion, implants, prostheses, and biomaterials related to prosthodontics. This journal publishes • Original research data of high scientific merit in the field of diagnosis, function, esthetics and stomatognathic physiology related to prosthodontic rehabilitation, physiology and mechanics of occlusion, mechanical and biologic aspects of prosthodontic materials including dental implants. • Review articles by experts on controversies and new developments in prosthodontics. • Case reports if they provide or document new fundamental knowledge.
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